Measurement Computing eZ-TOMAS rev.11.0 - Manual (Page 75)

Using a Statistical Report to Generate Limits
Statistical reports can be used to automatically generate limit values based on history data. If you have
acquired and stored data at a steady state machine condition Tomas can calculate limits for you based on
the Average and Variance of the data.
1. On the Display pull-down menu select Statistical; the History Data window will open.
2. Drag the top slide pointer across the time scale to select the Start Date and Time for the report.
3. Drag the lower slide pointer across the time scale to select the End Date and Time for the report.
4. Click the <OK> button. The Statistical Report will be displayed.
5. Open the File pull-down menu.
6. Select “Generate Limits.” The Limit Generation dialog box will appear (see following figure).
7. Select the Spectral Bands for which limits should be generated.
Limit values are not used if:
(a) the ‘HiHi limit value’ minus the ‘LoLo limit value’ is less than 5% of the
instrument scale, or
(b) the limit value is outside of the instrument range.
Limit Generation
8. In the Limit Value Calculation panel, specify the Standard Deviation to be used for Alert High,
Alert Low, and Danger High, Danger Low.
9. Click the button. A prompt will appear, asking if you want to Save New Limits.
10. Click <Yes>.
eZ-TOMAS 947494 Display Menu …. Reports 8-3